Handy Reference List of School Shootings in the United States 1700-2013 says it all

Prior to 1989, there were only a handful of incidents in which two or more victims were killed by firearms at a school, including the 1966 University of Texas massacre, the 1974 Olean High School shooting, the 1976 California State University, Fullerton massacre, and the 1979 Cleveland Elementary School shooting (the 1927 Bath School disaster was a bombing, not a shooting, with a firearm used only to detonate explosives). School shootings prior to the late 1990s, when they received intensive press and official coverage, were considered local incidents and may be substantially underreported in current tabulations, raising questions as to whether school shootings are actually increasing or are simply receiving more attention in recent years. From 1989 to 2012, there have been at least 40 such incidents.

(If this was more widely known the grabbers would have a real tough time doing what it looks like they are going to do)

History

It should be noted that the following list is mostly derived from the archives of the New York Times news articles, where prior to 1950's, very little information was reported from the Mid West and the West Coast. Although accurate in the actual accounts noted below, this list is most likely incomplete, devoid of any incidences west of the Mississippi River prior to the mid 1900's.

1700s

The earliest known United States shooting to happen on school property was the Pontiac's Rebellion school massacre on July 26, 1764, where four Lenape American Indians entered the schoolhouse near present-day Greencastle, Pennsylvania, shot and killed schoolmaster Enoch Brown, and killed nine or ten children (reports vary). Only three children survived.

1800s

November 2, 1853: Louisville, Kentucky A student, Matthew Ward, bought a self-cocking pistol in the morning, went to school and killed schoolmaster Mr. Butler for excessively punishing his brother the day before. Even though he shot the schoolmaster point blank in front of his classmates, he was acquitted.

September 11, 1859: Oakland, California Edward Carpenter accidentally shot himself dead while hunting on campus, he was one of the few students who were permitted to have a firearm at school.

June 8, 1867: New York City At Public School No. 18, a 13 year old boy brought a pistol loaded and capped, without the knowledge of his parents or school-teachers, and shot and injured a classmate.

December 22, 1868: Chattanooga, Tennessee A boy who refused to be whipped and left school, returned, with his brother and a friend, the next day to seek revenge on his teacher. Not finding the teacher at the school, they continued to his house, where a gun battle rang out, leaving three dead. Only the brother survived...>>>>

The health insurance mandate in the 2010 Patient Protection and Affordable Care Act, also known as Obamacare, is an idea hatched in 1989 by Stuart M. Butler at The Heritage Foundation in a publication titled "Assuring Affordable Health Care for All Americans". This was also the model for Mitt Romney's health care plan in Massachusetts. Source

Well, let's see. How many millions of prescriptions for things like Zoloft and Viagra per year (Lipitor is a cholesterol drug- not a psychotic drug)? And how many school shooting incidents a year? We should be having many hundreds of more times more shootings if that is the cause. People didn't have cable TV or the Internet or video games as much before 1989 either.

Well, let's see. How many millions of prescriptions for things like Zoloft and Viagra per year (Lipitor is a cholesterol drug- not a psychotic drug)? And how many school shooting incidents a year? We should be having many hundreds of more times more shootings if that is the cause. People didn't have cable TV or the Internet or video games as much before 1989 either.

CNN got big after 1987.

More Government = Less Freedom
Communism never disappeared it only changed its name to Social Democrat
Emotion and Logic mix like oil and water

There are too many parameters. And that is on purpose. There are things that you can observe, though.

Did you know that wasps are good for growing okra? They are. I found this out by observation.

There are too many insects to plot and graph, but by just watching and observing, after killing all the wasps in the area, I noticed that my okra was rotting. So, I tried to figure out why. I noticed that the flowers would wilt, after a couple of days, and then the fruit would rot before it hardly had a chance to grow. I began to pluck the flowers when I saw them wilt and the okra pods grew wonderfully.

After a few weeks, the wasps returned, and I watched them. They were oh so bothersome as I walked between the rows, but I observed and I saw them eating something around the base of the okra plant. I watched one for a while and, lo and behold, the flower droped off. I said to my self, is this coincidence or did that wasp just save my okra pod from certain rot? I watched again, another wasp did the same thing.

After serval observations, I came to conclusion of "don't kill the damn wasps"! Ever since then, I've not been stung by one (even when I chase them out of my four wheeler), and I don't kill them.

There are too many parameters. And that is on purpose. There are things that you can observe, though.
Did you know that wasps are good for growing okra? They are. I found this out by observation.
After serval observations, I came to conclusion of "don't kill the damn wasps"! Ever since then, I've not been stung by one (even when I chase them out of my four wheeler), and I don't kill them.

edit: I think we have an agreement, me and the wasps.

Well that was a fascinating little story. Thanks for sharing. The topic was drugs, kids and why they are spraying their schools with bullets. I'm interested in trying to find an answer to that. Are you?

Here is omeone who is: one of the worlds leading experts on SSRI drugs-Dr. David Healy- has studied the problem, prescribed the drugs, and has written about it extensively.

Both clinical trial and pharmacovigilance data point to possible links between these drugs and violent behaviours. The legal cases outlined returned a variety of verdicts that may in part have stemmed from different judicial processes. Many jurisdictions appear not to have considered the possibility that a prescription drug may induce violence.

In these trials, hostile events are found to excess in both adults and children on paroxetine compared with placebo, and are found across indications, and both on therapy and during withdrawal. The rates were highest in children with obsessive-compulsive disorder (OCD), where the odds ratio of a hostile event was 17 times greater ...

Case studies described at link

Here's an excerpt from the first case:

n 1998, a new family doctor, unaware of this adverse reaction to fluoxetine, prescribed paroxetine 20 mg to DS, for what was diagnosed as an anxiety disorder. Two days later having had, it is believed, two doses of medication, DS using a gun put three bullets each through the heads of his wife, his daughter who was visiting, and his nine-month-old granddaughter before killing himself.

Dr. David Healy (co author of the paper) is a recognized expert on SSRI's

The health insurance mandate in the 2010 Patient Protection and Affordable Care Act, also known as Obamacare, is an idea hatched in 1989 by Stuart M. Butler at The Heritage Foundation in a publication titled "Assuring Affordable Health Care for All Americans". This was also the model for Mitt Romney's health care plan in Massachusetts. Source

Maybe law enforcement shouldn't have access to these "weapons of war" because their children may be unstable. Maybe they shouldn't be allowed to enter law enforcement if they have children. The risk is just too great! Imagine what the offspring of a SWAT member could get hold if if they went off their rocker. What about the neighbor's children of LEO who could break into their home when the LEO is out? Maybe law enforcement officer should be barren and live only in isolated, fortified compounds?

XNN

"They sell us the president the same way they sell us our clothes and our cars. They sell us every thing from youth to religion the same time they sell us our wars. I want to know who the men in the shadows are. I want to hear somebody asking them why. They can be counted on to tell us who our enemies are but theyre never the ones to fight or to die." - Jackson Browne Lives In The Balance